CHAPTER 1

CHAPTER 1

LAN Design

As a business grows, so does its networking requirements. To keep pace with a business's expansion and new emerging technologies, a network must be designed to scale. A network that scales well is not only one that can handle growing traffic demands, but also one designed to expand as needed. This short chapter sets the stage for the rest of the course. This chapter covers the campus wired LAN designs and appropriate device selections that you can use to systematically design a highly functional network.

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Study Guide

Campus Wired LAN Designs

An enterprise network must be designed to support the exchange of various types of network traffic, including data files, email, IP telephony, and video applications for multiple business units.

Hierarchical Network Design

Enterprise networks are large multilocation networks that often span the globe. They must be able to support a variety of critical applications, converge different network traffic types, address diverse business needs, and provide centralized management control. The basic building block for enterprise networks is the LAN. The LAN is the networking infrastructure that provides access to network services for end users. LANs can be wired or wireless. Over a small geographic area, an enterprise interconnects these LANs into a campus network.

The campus wired LAN uses a hierarchical design model to break up the design into three layers. Designing a network using the three-layer hierarchical design model helps optimize the network. In Figure 1-1, label the three layers of the hierarchical design model.

Figure 1-1 Hierarchical Design Model

Hierarchical Design Model

Internet

Internet

Chapter 1: LAN Design 3

Briefly describe each layer of the hierarchical design model. __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________ __________________________________________________________________________________________

Identify Scalability Terminology

Match the definition on the left with the term on the right. This is a one-to-one matching exercise.

Definition

___ Isolates routing updates and minimizes the size of routing tables

___ Cisco proprietary distance vector routing protocol ___ Allows for redundant paths by eliminating switching

loops ___ Technique for aggregating multiple links between

equipment to increase bandwidth ___ Minimizes the possibility of a single point of failure ___ Supports new features and devices without requiring

major equipment upgrades ___ Link-state routing protocol with a two-layer hierar-

chical design ___ Increases flexibility, reduces costs, and provides

mobility to users

Terms

a. Modular equipment b. OSPF c. EIGRP d. Wireless LANs e. Redundancy f. Spanning Tree Protocol g. Scalable Routing Protocol h. EtherChannel

Selecting Network Devices

When designing a network, it is important to select the proper hardware to meet current network requirements and to allow for network growth. Within an enterprise network, both switches and routers play a critical role in network communication.

4 Scaling Networks v6 Labs & Study Guide

Selecting Switch Hardware

Match the business consideration on the left with the switch feature on the right. This is a one-to-one matching exercise.

Business Consideration

___ Should provide continuous access to the network ___ Daisy-chain switches with high-bandwidth throughput ___ Refers to a switch's ability to support the appropriate

number of devices on the network ___ Ability to adjust to growth of network users ___ How fast the interfaces will process network data ___ Important consideration in a network where there

may be congested ports to servers or other areas of the network ___ Provides electrical current to other device and supports redundant power supplies ___ Switches with preset features or options ___ Depends on the number and speed of the interfaces, supported features, and expansion capability ___ Switches with insertable switching line/port cards

Switch Feature

a. Reliability b. Modular c. Uninterruptible power supply d. Stackable e. Frame buffers f. Cost g. Fixed configuration h. Scalability i. Port speed j. Port density

Selecting Router Hardware

In Table 1-1, select the router category that applies to each description.

Table 1-1 Identify Router Category Features

Router Description

Branch Routers

Fast performance with high security for data centers, campus, and branch networks Simple network configuration and management for LANs and WANs Optimizes services on a single platform End-to-end delivery of subscriber services Delivers next-generation Internet experiences across all devices and locations High capacity and scalability with hierarchical quality of service Maximizes local services and ensures 24/7/365 uptime Unites campus, data center, and branch networks

Network Edge Routers

Service Provider Routers

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